Home / 138,390.69-190,946.25-77,949.30

Finding the Fourth Proportional to 138,390.69, 190,946.25 and 77,949.30

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Solution

The fourth proportional to 138,390.69, 190,946.25 and 77,949.30 is: 107,551.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,390.69 : 190,946.25 = 77,949.30 : x
  2. Step 2: Convert to fraction form
    138,390.69/190,946.25 = 77,949.30/x
  3. Step 3: Cross multiply
    138,390.69x = 190,946.25 × 77,949.30
  4. Step 4: Simplify right side
    138,390.69x = 14,884,126,525.13
  5. Step 5: Solve for x
    x = 14,884,126,525.13/138,390.69
  6. Step 6: Final answer
    x = 107,551.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.